JWhiteSpacesFacet.hh

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#ifndef __JLANG__JWHITESPACESFACET__
#define __JLANG__JWHITESPACESFACET__

#include <locale>
#include <string>


/**
 * \author mdejong
 */

namespace JLANG {}
namespace JPP { using namespace JLANG; }

namespace JLANG {

  
  /**
   * Auxiliary class to ensure that the mask set is defined prior to
   * the ctype<>() constructor call.
   */
  class JMask {
  public:

    typedef std::ctype<char>         ctype;
    
  protected:
    ctype::mask mask_set[ctype::table_size];
  };


  /**
   * Auxiliary class to specify white space character(s) in currect locale.
   */
  class JWhiteSpacesFacet : 
    private JMask,
    public  std::ctype<char>
  {
  public:
    /**
     * Constructor.
     *
     * \param  loc       current locale
     * \param  ws        white space character
     */
    JWhiteSpacesFacet(const std::locale& loc,
                      const char         ws) : 
      JMask(),
      JMask::ctype(mask_set)
    {
      configure(loc, std::string(1, ws));
    }


    /**
     * Constructor.
     *
     * \param  loc       current locale
     * \param  ws        white space character(s)
     */
    JWhiteSpacesFacet(const std::locale& loc,
                      const std::string& ws) : 
      JMask(),
      JMask::ctype(mask_set)
    {
      configure(loc, ws);
    }

  private:
    /**
     * Configure.
     *
     * \param  loc       current locale
     * \param  ws        white space character(s)
     */
    void configure(const std::locale& loc,
                   const std::string& ws)
    {
      using namespace std;

      char buffer[table_size];

      for (unsigned int i = 0; i != table_size; ++i) {
        buffer[i] = (char) i;
      }

      use_facet<JMask::ctype>(loc).is(buffer, buffer + table_size, mask_set);

      for (unsigned int i = 0; i != table_size; ++i) {
        if (mask_set[i] & JMask::ctype::space) {
          mask_set[i] ^= JMask::ctype::space;
        }
      }

      for (string::const_iterator i = ws.begin(); i != ws.end(); ++i) {
        mask_set[(int) *i] |= JMask::ctype::space;
      }
    }
  };
}

#endif